No real plans for sporella. She will get a mention in certain endings. As for the arts, well see if I get around to it.
I mean would there be a different outcome for the endless eclair if Brookes takes the deal with Wallywix since in the normal route and in the vore route without taking the deal, the Wallywix chocolate battle happens but since there's now an option to take the deal which completes the candy factory quest, even after defeating her, Brookes says "We cudda worked something out" even though Brookes technically did by accepting the deal earlier.